THE CRANE-FLIES OF NEW YORK PART II 883 



3. Ventral lobes of spiracular disk bearing one or two very long, dark setae in addition to 

 the shorter yellowish fringe; inner face of each lobe with a capillary black line which 

 is suddenly expanded at its inner end into a triangular brown mark, the two marks 

 inclosing an oval pale area between their proximal ends; lateral lobes with a capillary 



black line E. fultonensis Alex. (p. 890) 



Ventral lobes of spiracular disk with apical fringe consisting of numerous long, pale setae; 

 inner face of each lobe lined with pale brown, at about midlength gradually expanded 

 into an elongate-triangular mark, the two marks inclosing a linear pale area between 

 their proximal ends; lateral lobes with a brown line E. longicornis (Walk.) (p. 888) 



Pupae 



1. Size large (length 25 mm. or over); pronotal breathing horns tapering to acute tips; 



cephalic crest small, reduced to four small tubercles; cell MI on wing pad present; 

 a strong spinous tubercle on either side of median line at base of second abdominal 



tergite; a tubercle on eye E. spinosa (0. S.) (p. 883) 



Size smaller (length under 18 mm.); pronotal breathing horns blunt at tips; cephalic 

 crest prominent; cell MI on wing pad lacking; no tubercles on second abdominal tergite 

 or on eye 2 



2. A tubercle on mesonotal scutellum E. longicornis (Walk.) (p. 888) 



No tubercle on mesonotal scutellum 3 



3. Pleurites of abdominal segments with a transverse row of three setae ventrad and slightly 



caudad of spiracle; antennae of male elongated E. cinerea Alex. (p. 886) 



Pleurites of abdominal segments with two stout setae dorsad and caudad of spirarh; 

 antennae short hi both sexes E. fultonensis Alex. (p. 890) 



Eriocera spinosa (0. S.) 



1859 Arrhenica spinosa 0. S. Proc. Acad. Nat. Sci. Phila., p. 244. 



Eriocera spinosa O. S. Mon. Dipt. N. Amer., part 4, p. 252-253. 



Eriocera spinosa is the commonest of the large species of the genus 

 in eastern North America. The larvae occur in great numbers beneath 

 rocks in rapid water in the autumn, when they form a considerable pro- 

 portion of the insect life in the streams. When about to pupate they go 

 to the neighboring banks and live for some time in the sand or gravel. 

 The habits of the larvae have been discussed by Alexander and Lloyd 

 (1914:16-17) and by Alexander (1915c:149). 



The larvae were found on May 1, 1913, along the banks of Fall Creek, 

 Ithaca, New York, in considerable numbers. They were associated with 

 young and mature pupae of E. longicornis, which were emerging in great 

 numbers at the time. On May 27, both larvae and pupae of E. spinosa 

 were found to be very abundant, the larvae being more numerous in the 

 wetter places, the pupae in the drier spots. They occurred at various 

 distances from the water's edge, from within a foot of the margin to as 

 far back as eight or ten feet. The pupae are found in short, more or less 

 vertical, burrows, from one to three inches below the surface. Not often 



